The guides will also note the possibility of new or worsening psychiatric
problems such as hearing voices, becoming suspicious for no reason, or becoming
manic.

Those psychiatric problems are "quite rare," affecting about one in a
thousand patients, Laughren says.

Talk to Your Doctor

Before taking ADHD drugs, patients should tell their doctor about any history
of heart problems or psychiatric problems and get a thorough checkup, says the
FDA.

Patients should also report any new symptoms -- including shortness of
breath, chest pain, fainting, or other possible signs of heart trouble, as well
as any mental problems -- while taking ADHD drugs.